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SPN FEB 2011 UVSystems
www.swimmingpoolnews.co.uk
THIS: atg UV have warranted their success in the leisure market to their breakthrough ECF system range
RIGHT: Hanovia is the only supplier of UV systems to manufacture its own UV lamps
polychromatic UV output (with an output between 185-400nm).
If, following exposure to low pressure UV lamps, microorganisms are capable of recovering, operators seriously need to consider upgrading to medium pressure technology. By providing permanent microbial deactivation, medium pressure UV offers peace of mind, something low pressure UV does not do.
Hanovia offers a safer method of non-chemical pool water disinfection with its UV systems. Water circulating through the pool is exposed to a specific spectrum of UV light, which is absorbed by microorganisms’ DNA, resulting in permanent, irreparable inactivation of the microorganism. UV light initiates photo-chemical and photo- oxidation reactions that destroy chloramines, the by-products of chlorine disinfection. This reduces the associated health risks along with unpleasant odours, eye and skin irritation, and corrosion to pool hall structures.
Chlorine is still required for residual disinfection, but pools using a UV system require up to 90% less chlorine than pools without UV. Hanovia systems monitor and adjust UV lamp output to appropriate levels, while automatic wipers keep the quartz sleeves surrounding the UV lamps clean and power switching ensures UV output varies according to demand, ensuring optimum performance at all times. The systems are compact and can usually be installed within existing pipe work. The only
regular maintenance is an annual service at which the lamp is changed. The Hanovia SwimPure range only uses medium pressure UV technology and all the lamps are optimised to promote the specific chemical reactions required for chloramine photolysis, hydroxyl radical production and disinfection. Hanovia is the only supplier of UV systems to manufacture its own UV lamps. Topline the company which specialises in offering total solutions for water treatment sees UV as one of the fastest growing options it offers to customers. The Topline ultraviolet treatment systems are full flow and can be configured to treat any size of pool. Using low pressure UV lamps at a wavelength of 254nm, the system has a proven germicidal effect. The flow of water through the system has been calculated to provide optimum contact with the UV light without any shadow areas, ensuring all the water is fully treated.
A survey of 250 commercial, hotel and local authorities pools carried out at Sheffield University claimed that over 70% had taken the decision to move to a UV system. Over half said that their decision had been based on cost and the increasing pressure from swimmers about the unpleasant effects in and around the pool. 60% said that ‘a safe, secure reliable system which would work’ was the main reason for opting for UV. The Sheffield University research reveals a bigger commitment to UV systems than most were aware of. Sixty three local authority pools confirmed in the research that they had opted for
“If, following exposure to low pressure UV lamps, microorganisms are capable of recovering, operators seriously need to consider upgrading to medium pressure technology”
UV because they were under joint pressure to increase the water quality.
Trade association SPATA’s technical review committee take the view it has always been accepted that neither ozone nor UV can be used without a residual oxidising disinfectant. The official advice of the Pure Water Treatment Advisory Group is that with these so called ‘alternative treatments’, a residual disinfectant should always be present in the water as well. In the case of SPATA and BISHTA standards, a residual disinfectant is chlorine or bromine based products or a polymeric biguanide. The worldwide phenomenon of UV systems has also seen more systems installed in US swimming pools than ever before. A new state by state research programme has reported that the switch to UV cleansing and water control has grown dramatically in the past three years and will bring a substantial change in the way pool systems are organised.
In Scandinavia the system is ‘inbuilt’ into pool management and in France, the world’s second largest pool market, UV sales have grown dramatically since 2008.
Such was the impact of a UV protection programme in Utah in the US that many believe it should be a legal requirement in all pools above a certain size. The reliability of the systems is a key fact behind the mandatory inclusion of UV systems for swimming facilities being considered by a number of states.
The Utah success, achieved through a mixture of public awareness and the implementation of UV protection, turned around a situation where 1,900 cases of bacteria issues in pools were reported last summer resulting in America’s largest outbreak. The UV systems restored the water quality over a 12 month period and the ‘Utah experience’ are now a well quoted UV legend.
atg UV Technology, were tasked with supplying and installing 60 UV systems across Utah to
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